<?php



function smarty_modifier_truncate($string, $sublen = 80, $etc = '...', $break_words = false, $middle = false)
{
$start=0;
$code="UTF-8";
       if($code == 'UTF-8') 
   { 
       //如果有中文则减去中文的个数
       $cncount=cncount($string);
       if($cncount>($sublen/2))
       {
            $sublen=ceil($sublen/2);
       }
       else 
       {
            $sublen=$sublen-$cncount;
       }
   
       $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/"; 
       preg_match_all($pa, $string, $t_string);

       if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."..."; 
       return join('', array_slice($t_string[0], $start, $sublen));
   } 
   else 
   { 
       $start = $start*2; 
       $sublen = $sublen*2;
       $strlen = strlen($string); 
       $tmpstr = '';

       for($i=0; $i<$strlen; $i++) 
       { 
           if($i>=$start && $i<($start+$sublen)) 
           { 
               if(ord(substr($string, $i, 1))>129) 
               { 
                   $tmpstr.= substr($string, $i, 2); 
               } 
               else 
               { 
                   $tmpstr.= substr($string, $i, 1); 
               } 
           } 
           if(ord(substr($string, $i, 1))>129) $i++;
       } 
       if(strlen($tmpstr)<$strlen ) $tmpstr.= "..."; 
       return $tmpstr;
   }

}


function cncount($str)
{
$len=strlen($str);
    $cncount=0;
  
    for($i=0;$i<$len;$i++)
   {
      $temp_str=substr($str,$i,1);
      
      if(ord($temp_str) > 127)
      {
          $cncount++;
      }
    }

    return ceil($cncount/3);
}


